/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:56:11,360 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:56:11,363 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:56:11,382 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:56:11,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:56:11,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:56:11,386 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:56:11,395 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:56:11,400 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:56:11,403 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:56:11,404 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:56:11,405 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:56:11,405 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:56:11,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:56:11,409 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:56:11,411 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:56:11,413 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:56:11,413 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:56:11,415 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:56:11,420 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:56:11,425 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:56:11,428 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:56:11,429 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:56:11,430 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:56:11,434 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:56:11,446 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:56:11,446 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:56:11,448 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:56:11,449 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:56:11,478 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:56:11,479 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:56:11,481 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:56:11,481 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:56:11,482 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:56:11,482 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:56:11,482 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:56:11,482 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:56:11,483 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:56:11,483 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:56:11,484 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:56:11,484 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:56:11,484 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:56:11,485 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:56:11,485 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:56:11,485 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:56:11,485 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:56:11,486 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:56:11,486 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:56:11,487 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:56:11,487 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:56:11,488 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:11,489 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:56:11,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:56:11,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:56:11,491 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:56:11,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:11,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:56:11,492 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:56:11,492 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:56:11,781 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:56:11,794 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:56:11,798 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:56:11,799 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:56:11,800 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:56:11,801 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-20 16:56:11,884 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d45f0dfd/1b6f772e678d47b78e7d8e1071f4c029/FLAGb5276fcb7 [2020-07-20 16:56:12,372 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:56:12,373 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-20 16:56:12,380 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d45f0dfd/1b6f772e678d47b78e7d8e1071f4c029/FLAGb5276fcb7 [2020-07-20 16:56:12,751 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d45f0dfd/1b6f772e678d47b78e7d8e1071f4c029 [2020-07-20 16:56:12,761 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:56:12,764 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:56:12,765 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:12,765 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:56:12,769 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:56:12,770 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:12" (1/1) ... [2020-07-20 16:56:12,773 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f29f361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:12, skipping insertion in model container [2020-07-20 16:56:12,773 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:12" (1/1) ... [2020-07-20 16:56:12,783 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:56:12,799 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:56:12,968 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:12,972 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:56:12,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:13,006 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:56:13,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13 WrapperNode [2020-07-20 16:56:13,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:13,007 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:56:13,007 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:56:13,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:56:13,019 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,024 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,025 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,029 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... [2020-07-20 16:56:13,034 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:56:13,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:56:13,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:56:13,035 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:56:13,036 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:13,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:56:13,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:56:13,203 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:56:13,203 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:56:13,204 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:56:13,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:56:13,205 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:56:13,205 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:56:13,205 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:56:13,205 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:56:13,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:56:13,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:56:13,409 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:56:13,409 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:56:13,414 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:13 BoogieIcfgContainer [2020-07-20 16:56:13,414 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:56:13,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:56:13,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:56:13,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:56:13,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:56:12" (1/3) ... [2020-07-20 16:56:13,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@658c9585 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:13, skipping insertion in model container [2020-07-20 16:56:13,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:13" (2/3) ... [2020-07-20 16:56:13,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@658c9585 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:13, skipping insertion in model container [2020-07-20 16:56:13,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:13" (3/3) ... [2020-07-20 16:56:13,425 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-2.c [2020-07-20 16:56:13,438 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:56:13,464 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:56:13,504 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:56:13,564 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:56:13,564 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:56:13,564 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:56:13,564 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:56:13,564 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:56:13,565 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:56:13,565 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:56:13,565 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:56:13,592 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:56:13,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:56:13,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:13,605 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:13,605 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:13,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:13,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:56:13,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:13,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013320676] [2020-07-20 16:56:13,622 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:13,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:13,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:13,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:13,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:13,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:56:13,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:13,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013320676] [2020-07-20 16:56:13,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:13,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:13,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391660024] [2020-07-20 16:56:13,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:13,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:13,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:13,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:13,806 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:56:13,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:13,924 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:56:13,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:13,927 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:56:13,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:13,939 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:56:13,940 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:56:13,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:56:13,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:56:13,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:56:13,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:56:13,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:56:13,998 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:56:13,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:13,999 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:56:13,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:13,999 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:56:14,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:56:14,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:14,002 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:14,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:14,219 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:14,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:14,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:56:14,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:14,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961256459] [2020-07-20 16:56:14,222 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:14,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:14,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:14,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:14,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:14,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:56:14,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:14,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961256459] [2020-07-20 16:56:14,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:14,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:14,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146833843] [2020-07-20 16:56:14,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:14,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:14,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:14,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:14,311 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:56:14,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:14,379 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:56:14,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:14,380 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:56:14,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:14,382 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:56:14,382 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:56:14,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:56:14,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:56:14,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:56:14,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:56:14,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:56:14,393 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:56:14,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:14,394 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:56:14,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:14,394 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:56:14,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:56:14,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:14,396 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:14,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:14,612 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:14,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:14,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:56:14,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:14,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261633410] [2020-07-20 16:56:14,615 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:14,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:14,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:14,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:14,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:14,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:14,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:14,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:14,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:14,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:14,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261633410] [2020-07-20 16:56:14,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:14,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:56:14,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703757638] [2020-07-20 16:56:14,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:56:14,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:14,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:56:14,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:56:14,958 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:56:15,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:15,103 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:56:15,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:15,104 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:56:15,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:15,106 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:56:15,107 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:56:15,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:15,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:56:15,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:56:15,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:56:15,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:56:15,127 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:56:15,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:15,129 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:56:15,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:56:15,129 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:56:15,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:56:15,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:15,133 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:15,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:15,338 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:15,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:15,339 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:56:15,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:15,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983072546] [2020-07-20 16:56:15,341 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:15,374 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:15,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:15,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:15,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:15,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:15,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,605 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:15,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983072546] [2020-07-20 16:56:15,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:15,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:56:15,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125430705] [2020-07-20 16:56:15,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:56:15,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:15,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:56:15,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:56:15,608 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:56:15,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:15,733 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:56:15,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:15,734 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:56:15,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:15,737 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:56:15,737 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:56:15,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:15,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:56:15,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:56:15,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:56:15,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:56:15,747 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:56:15,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:15,748 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:56:15,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:56:15,748 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:56:15,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:56:15,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:15,750 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:15,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:15,966 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:15,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:15,967 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:56:15,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:15,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598783965] [2020-07-20 16:56:15,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:16,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:16,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:16,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:16,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:16,065 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:56:16,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:16,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,450 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:56:16,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598783965] [2020-07-20 16:56:16,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:16,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:56:16,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265304040] [2020-07-20 16:56:16,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:16,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:16,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:16,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:16,453 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:56:16,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:16,639 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:56:16,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:16,640 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:56:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:16,642 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:56:16,642 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:56:16,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:16,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:56:16,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:56:16,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:56:16,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:56:16,654 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:56:16,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:16,654 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:56:16,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:16,655 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:56:16,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:56:16,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:16,657 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:16,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:16,872 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:16,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:16,873 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:56:16,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:16,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231967398] [2020-07-20 16:56:16,875 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:16,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:16,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:16,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:16,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:16,972 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:56:16,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:17,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,282 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:56:17,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231967398] [2020-07-20 16:56:17,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:17,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:56:17,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576804782] [2020-07-20 16:56:17,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:17,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:17,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:17,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:17,285 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:56:17,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:17,567 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:56:17,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:17,568 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:56:17,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:17,575 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:56:17,576 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:56:17,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:17,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:56:17,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:56:17,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:56:17,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:56:17,601 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:56:17,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:17,602 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:56:17,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:17,603 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:56:17,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:56:17,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:17,606 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:17,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:17,821 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:17,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:17,822 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:56:17,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:17,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691366677] [2020-07-20 16:56:17,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:17,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:17,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:17,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:17,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:17,918 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:56:17,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:18,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,250 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:56:18,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691366677] [2020-07-20 16:56:18,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:18,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:56:18,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422007787] [2020-07-20 16:56:18,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:18,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:18,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:18,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:18,253 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:56:18,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:18,399 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:56:18,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:18,400 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:56:18,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:18,402 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:56:18,402 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:56:18,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:18,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:56:18,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:56:18,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:56:18,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:56:18,416 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:56:18,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:18,416 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:56:18,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:18,416 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:56:18,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:56:18,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:18,419 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:18,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:18,634 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:18,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:18,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:56:18,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:18,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515943367] [2020-07-20 16:56:18,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:18,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:18,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:18,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:18,749 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:56:18,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:18,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,966 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:56:18,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515943367] [2020-07-20 16:56:18,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:18,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:56:18,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837381469] [2020-07-20 16:56:18,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:56:18,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:18,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:56:18,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:56:18,975 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:56:19,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:19,097 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:56:19,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:19,097 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:56:19,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:19,099 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:56:19,099 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:56:19,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:19,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:56:19,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:56:19,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:56:19,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:56:19,117 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:56:19,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:19,118 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:56:19,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:56:19,118 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:56:19,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:56:19,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:19,127 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:19,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:19,330 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:19,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:19,331 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:56:19,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:19,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23917673] [2020-07-20 16:56:19,333 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:19,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:19,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:19,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:19,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:19,464 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:56:19,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:19,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,080 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:56:20,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23917673] [2020-07-20 16:56:20,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:20,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:20,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397649574] [2020-07-20 16:56:20,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:20,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:20,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:20,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:20,082 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:56:20,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:20,255 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:56:20,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:20,256 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:56:20,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:20,257 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:56:20,257 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:56:20,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:20,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:56:20,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:56:20,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:56:20,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:56:20,286 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:56:20,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:20,286 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:56:20,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:20,287 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:56:20,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:56:20,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:20,289 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:20,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,504 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:20,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:20,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:56:20,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:20,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452800032] [2020-07-20 16:56:20,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:20,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:20,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:20,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:20,608 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:56:20,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:20,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,980 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:56:20,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452800032] [2020-07-20 16:56:20,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:20,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:56:20,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65454514] [2020-07-20 16:56:20,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:20,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:20,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:20,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:20,983 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:56:21,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:21,182 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:56:21,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:21,183 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:56:21,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:21,184 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:56:21,184 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:56:21,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:21,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:56:21,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:56:21,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:56:21,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:56:21,203 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:56:21,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:21,203 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:56:21,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:21,204 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:56:21,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:56:21,208 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:21,208 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:21,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:21,409 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:21,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:21,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:56:21,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:21,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949517998] [2020-07-20 16:56:21,411 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:21,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:21,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:21,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:21,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:21,547 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:56:21,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:21,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:22,157 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:56:22,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949517998] [2020-07-20 16:56:22,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:22,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:56:22,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364158048] [2020-07-20 16:56:22,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:22,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:22,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:22,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:22,160 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:56:22,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:22,573 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:56:22,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:22,574 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:56:22,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:22,577 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:56:22,577 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:56:22,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:56:22,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:56:22,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:56:22,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:56:22,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:56:22,587 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:56:22,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:22,587 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:56:22,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:22,588 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:56:22,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:56:22,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:22,590 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:22,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:22,805 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:22,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:22,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:56:22,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:22,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079794121] [2020-07-20 16:56:22,807 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:22,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:22,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:22,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:22,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:22,967 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:56:22,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:23,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,792 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:56:23,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079794121] [2020-07-20 16:56:23,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:23,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:56:23,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567451552] [2020-07-20 16:56:23,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:23,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:23,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:23,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:23,794 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:56:24,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:24,618 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:56:24,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:56:24,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:56:24,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:24,624 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:56:24,624 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:56:24,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:56:24,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:56:24,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:56:24,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:56:24,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:56:24,643 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:56:24,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:24,644 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:56:24,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:24,644 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:56:24,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:56:24,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:24,646 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:24,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:24,862 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:24,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:24,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:56:24,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:24,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917626865] [2020-07-20 16:56:24,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:24,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:24,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:24,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:24,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:24,986 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:56:24,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:25,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:25,498 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:56:25,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917626865] [2020-07-20 16:56:25,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:25,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:25,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328456658] [2020-07-20 16:56:25,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:25,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:25,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:25,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:25,500 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:56:25,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:25,678 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:56:25,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:25,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:56:25,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:25,681 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:56:25,681 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:56:25,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:25,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:56:25,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:56:25,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:56:25,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:56:25,703 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:56:25,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:25,703 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:56:25,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:25,703 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:56:25,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:56:25,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:25,705 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:25,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:25,919 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:25,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:25,920 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:56:25,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:25,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533792672] [2020-07-20 16:56:25,920 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:26,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:26,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:26,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:26,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:26,116 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:56:26,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:26,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:26,845 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:56:26,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533792672] [2020-07-20 16:56:26,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:26,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:56:26,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820631656] [2020-07-20 16:56:26,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:26,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:26,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:26,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:26,851 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:56:27,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:27,372 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:56:27,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:56:27,377 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:56:27,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:27,381 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:56:27,381 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:56:27,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:56:27,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:56:27,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:56:27,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:56:27,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:56:27,412 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:56:27,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:27,413 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:56:27,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:27,413 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:56:27,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:56:27,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:27,416 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:27,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:27,631 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:27,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:27,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:56:27,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:27,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270910761] [2020-07-20 16:56:27,634 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:27,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:27,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:27,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:27,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:27,735 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:56:27,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:27,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,091 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:56:28,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270910761] [2020-07-20 16:56:28,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:28,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:56:28,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268307541] [2020-07-20 16:56:28,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:28,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:28,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:28,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:28,094 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:56:28,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:28,252 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:56:28,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:28,253 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:56:28,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:28,256 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:56:28,256 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:56:28,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:28,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:56:28,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:56:28,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:56:28,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:56:28,278 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:56:28,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:28,279 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:56:28,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:28,279 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:56:28,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:56:28,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:28,284 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:28,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:28,500 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:28,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:28,500 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:56:28,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:28,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576085440] [2020-07-20 16:56:28,502 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:28,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:28,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:28,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:28,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:28,690 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:56:28,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:29,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,891 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:56:29,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576085440] [2020-07-20 16:56:29,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:29,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:56:29,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503906341] [2020-07-20 16:56:29,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:29,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:29,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:29,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:29,894 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:56:30,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:30,461 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:56:30,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:56:30,462 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:56:30,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:30,466 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:56:30,466 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:56:30,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:56:30,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:56:30,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:56:30,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:56:30,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:56:30,488 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:56:30,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:30,488 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:56:30,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:30,489 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:56:30,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:56:30,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:30,492 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:30,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:30,707 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:30,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:30,707 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:56:30,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:30,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752792972] [2020-07-20 16:56:30,708 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:30,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:30,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:30,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:30,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:30,827 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:56:30,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:31,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:31,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:31,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:31,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:31,190 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:56:31,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752792972] [2020-07-20 16:56:31,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:31,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:56:31,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861123889] [2020-07-20 16:56:31,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:31,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:31,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:31,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:31,192 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:56:31,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:31,355 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:56:31,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:31,356 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:56:31,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:31,359 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:56:31,359 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:56:31,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:31,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:56:31,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:56:31,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:56:31,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:56:31,376 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:56:31,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:31,377 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:56:31,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:31,377 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:56:31,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:56:31,380 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:31,380 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:31,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:31,594 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:31,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:31,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1156827333, now seen corresponding path program 2 times [2020-07-20 16:56:31,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:31,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947419567] [2020-07-20 16:56:31,595 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:31,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:31,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:31,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:31,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:31,772 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 110 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:56:31,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:32,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,979 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 116 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:56:32,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947419567] [2020-07-20 16:56:32,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:32,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:56:32,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095423645] [2020-07-20 16:56:32,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:56:32,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:32,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:56:32,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:32,981 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 23 states. [2020-07-20 16:56:33,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:33,716 INFO L93 Difference]: Finished difference Result 393 states and 799 transitions. [2020-07-20 16:56:33,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:56:33,717 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 118 [2020-07-20 16:56:33,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:33,721 INFO L225 Difference]: With dead ends: 393 [2020-07-20 16:56:33,721 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 16:56:33,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 207 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=261, Invalid=1221, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:56:33,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 16:56:33,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 183. [2020-07-20 16:56:33,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:56:33,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 321 transitions. [2020-07-20 16:56:33,740 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 321 transitions. Word has length 118 [2020-07-20 16:56:33,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:33,740 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 321 transitions. [2020-07-20 16:56:33,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:56:33,741 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 321 transitions. [2020-07-20 16:56:33,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-20 16:56:33,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:33,743 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:33,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:33,958 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:33,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:33,959 INFO L82 PathProgramCache]: Analyzing trace with hash 767209796, now seen corresponding path program 3 times [2020-07-20 16:56:33,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:33,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556927305] [2020-07-20 16:56:33,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:34,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:34,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:34,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:34,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:34,110 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 20 proven. 96 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 16:56:34,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:34,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 20 proven. 104 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-20 16:56:35,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556927305] [2020-07-20 16:56:35,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:35,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:35,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230814357] [2020-07-20 16:56:35,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:35,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:35,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:35,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:35,023 INFO L87 Difference]: Start difference. First operand 183 states and 321 transitions. Second operand 16 states. [2020-07-20 16:56:35,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:35,218 INFO L93 Difference]: Finished difference Result 203 states and 360 transitions. [2020-07-20 16:56:35,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:35,219 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 104 [2020-07-20 16:56:35,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:35,224 INFO L225 Difference]: With dead ends: 203 [2020-07-20 16:56:35,225 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 16:56:35,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 185 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:35,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 16:56:35,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 188. [2020-07-20 16:56:35,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 16:56:35,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 333 transitions. [2020-07-20 16:56:35,243 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 333 transitions. Word has length 104 [2020-07-20 16:56:35,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:35,246 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 333 transitions. [2020-07-20 16:56:35,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:35,246 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 333 transitions. [2020-07-20 16:56:35,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:56:35,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:35,249 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:35,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:35,466 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:35,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:35,466 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:56:35,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:35,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690323858] [2020-07-20 16:56:35,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:35,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:35,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:35,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:35,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:35,648 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:56:35,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:36,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:56:36,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690323858] [2020-07-20 16:56:36,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:36,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:56:36,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362371425] [2020-07-20 16:56:36,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:36,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:36,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:36,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:36,644 INFO L87 Difference]: Start difference. First operand 188 states and 333 transitions. Second operand 17 states. [2020-07-20 16:56:36,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:36,994 INFO L93 Difference]: Finished difference Result 374 states and 685 transitions. [2020-07-20 16:56:36,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:36,995 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:56:36,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:37,000 INFO L225 Difference]: With dead ends: 374 [2020-07-20 16:56:37,000 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:56:37,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:56:37,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:56:37,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:56:37,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:56:37,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 327 transitions. [2020-07-20 16:56:37,018 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 327 transitions. Word has length 120 [2020-07-20 16:56:37,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:37,019 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 327 transitions. [2020-07-20 16:56:37,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:37,019 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 327 transitions. [2020-07-20 16:56:37,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:56:37,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:37,022 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:37,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:37,236 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:37,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:37,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-20 16:56:37,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:37,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132033292] [2020-07-20 16:56:37,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:37,381 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:37,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:37,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:37,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:37,460 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 16:56:37,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:38,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,372 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 16:56:38,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132033292] [2020-07-20 16:56:38,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:38,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:38,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650456665] [2020-07-20 16:56:38,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:38,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:38,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:38,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:38,374 INFO L87 Difference]: Start difference. First operand 190 states and 327 transitions. Second operand 16 states. [2020-07-20 16:56:38,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:38,594 INFO L93 Difference]: Finished difference Result 219 states and 399 transitions. [2020-07-20 16:56:38,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:38,595 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-20 16:56:38,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:38,598 INFO L225 Difference]: With dead ends: 219 [2020-07-20 16:56:38,598 INFO L226 Difference]: Without dead ends: 215 [2020-07-20 16:56:38,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:38,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-07-20 16:56:38,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 207. [2020-07-20 16:56:38,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:56:38,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 375 transitions. [2020-07-20 16:56:38,616 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 375 transitions. Word has length 109 [2020-07-20 16:56:38,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:38,617 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 375 transitions. [2020-07-20 16:56:38,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:38,617 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 375 transitions. [2020-07-20 16:56:38,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-07-20 16:56:38,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:38,620 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:38,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:38,834 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:38,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:38,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1569040385, now seen corresponding path program 3 times [2020-07-20 16:56:38,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:38,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150331906] [2020-07-20 16:56:38,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:38,939 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:38,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:38,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:38,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 115 proven. 75 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-20 16:56:39,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:39,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,981 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 115 proven. 78 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2020-07-20 16:56:39,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150331906] [2020-07-20 16:56:39,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:39,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:56:39,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828340146] [2020-07-20 16:56:39,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:39,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:39,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:39,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:39,983 INFO L87 Difference]: Start difference. First operand 207 states and 375 transitions. Second operand 19 states. [2020-07-20 16:56:40,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:40,498 INFO L93 Difference]: Finished difference Result 435 states and 816 transitions. [2020-07-20 16:56:40,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:56:40,499 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 119 [2020-07-20 16:56:40,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:40,502 INFO L225 Difference]: With dead ends: 435 [2020-07-20 16:56:40,502 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 16:56:40,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 208 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-20 16:56:40,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 16:56:40,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 212. [2020-07-20 16:56:40,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:56:40,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:56:40,530 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 119 [2020-07-20 16:56:40,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:40,530 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:56:40,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:40,531 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:56:40,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:56:40,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:40,536 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:40,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:40,749 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:40,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:40,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 7 times [2020-07-20 16:56:40,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:40,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283317232] [2020-07-20 16:56:40,750 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:40,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:40,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:40,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:40,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:40,909 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-20 16:56:40,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:41,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:41,572 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 16:56:41,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283317232] [2020-07-20 16:56:41,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:41,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:41,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057669493] [2020-07-20 16:56:41,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:41,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:41,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:41,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:41,575 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 14 states. [2020-07-20 16:56:41,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:41,755 INFO L93 Difference]: Finished difference Result 242 states and 431 transitions. [2020-07-20 16:56:41,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:41,755 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 16:56:41,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:41,758 INFO L225 Difference]: With dead ends: 242 [2020-07-20 16:56:41,758 INFO L226 Difference]: Without dead ends: 238 [2020-07-20 16:56:41,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:41,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-07-20 16:56:41,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 212. [2020-07-20 16:56:41,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:56:41,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:56:41,777 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 121 [2020-07-20 16:56:41,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:41,777 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:56:41,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:41,777 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:56:41,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 16:56:41,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:41,781 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:41,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:41,997 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:41,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:41,998 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 8 times [2020-07-20 16:56:41,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:41,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703402045] [2020-07-20 16:56:41,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:42,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:42,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:42,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:42,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:42,175 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-20 16:56:42,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:42,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,838 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-20 16:56:42,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703402045] [2020-07-20 16:56:42,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:42,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:42,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007178495] [2020-07-20 16:56:42,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:42,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:42,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:42,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:42,841 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 14 states. [2020-07-20 16:56:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:43,004 INFO L93 Difference]: Finished difference Result 232 states and 409 transitions. [2020-07-20 16:56:43,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:43,004 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-20 16:56:43,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:43,007 INFO L225 Difference]: With dead ends: 232 [2020-07-20 16:56:43,007 INFO L226 Difference]: Without dead ends: 228 [2020-07-20 16:56:43,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:43,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2020-07-20 16:56:43,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 212. [2020-07-20 16:56:43,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 16:56:43,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 371 transitions. [2020-07-20 16:56:43,025 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 371 transitions. Word has length 133 [2020-07-20 16:56:43,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:43,025 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 371 transitions. [2020-07-20 16:56:43,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:43,025 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 371 transitions. [2020-07-20 16:56:43,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2020-07-20 16:56:43,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:43,029 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:43,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:43,243 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:43,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:43,243 INFO L82 PathProgramCache]: Analyzing trace with hash 857210524, now seen corresponding path program 9 times [2020-07-20 16:56:43,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:43,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215155177] [2020-07-20 16:56:43,244 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:43,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:56:43,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:43,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:43,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:43,515 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 350 proven. 32 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2020-07-20 16:56:43,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:44,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,668 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 81 proven. 204 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2020-07-20 16:56:44,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215155177] [2020-07-20 16:56:44,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:44,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:56:44,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390289400] [2020-07-20 16:56:44,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:44,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:44,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:44,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:44,670 INFO L87 Difference]: Start difference. First operand 212 states and 371 transitions. Second operand 17 states. [2020-07-20 16:56:45,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:45,118 INFO L93 Difference]: Finished difference Result 418 states and 774 transitions. [2020-07-20 16:56:45,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:56:45,119 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 158 [2020-07-20 16:56:45,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:45,123 INFO L225 Difference]: With dead ends: 418 [2020-07-20 16:56:45,123 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 16:56:45,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 290 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:56:45,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 16:56:45,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 183. [2020-07-20 16:56:45,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:56:45,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 288 transitions. [2020-07-20 16:56:45,145 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 288 transitions. Word has length 158 [2020-07-20 16:56:45,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:45,146 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 288 transitions. [2020-07-20 16:56:45,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:45,146 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 288 transitions. [2020-07-20 16:56:45,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:56:45,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:45,150 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:45,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:45,363 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:45,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:45,364 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 10 times [2020-07-20 16:56:45,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:45,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356109840] [2020-07-20 16:56:45,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:45,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:45,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:45,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:45,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 16:56:45,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:45,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,343 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 16:56:46,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356109840] [2020-07-20 16:56:46,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:46,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:46,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633345747] [2020-07-20 16:56:46,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:46,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:46,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:46,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:46,346 INFO L87 Difference]: Start difference. First operand 183 states and 288 transitions. Second operand 14 states. [2020-07-20 16:56:46,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:46,560 INFO L93 Difference]: Finished difference Result 190 states and 298 transitions. [2020-07-20 16:56:46,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:46,561 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-20 16:56:46,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:46,564 INFO L225 Difference]: With dead ends: 190 [2020-07-20 16:56:46,564 INFO L226 Difference]: Without dead ends: 186 [2020-07-20 16:56:46,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:46,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-20 16:56:46,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 166. [2020-07-20 16:56:46,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 16:56:46,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 255 transitions. [2020-07-20 16:56:46,579 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 255 transitions. Word has length 145 [2020-07-20 16:56:46,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:46,580 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 255 transitions. [2020-07-20 16:56:46,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:46,580 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 255 transitions. [2020-07-20 16:56:46,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-20 16:56:46,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:46,583 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 12, 12, 11, 9, 9, 9, 9, 9, 9, 9, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:46,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,797 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:46,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:46,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1851579368, now seen corresponding path program 5 times [2020-07-20 16:56:46,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:46,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697931640] [2020-07-20 16:56:46,799 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,989 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:46,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:46,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:46,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:47,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1243 backedges. 638 proven. 149 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2020-07-20 16:56:47,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:48,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1243 backedges. 210 proven. 269 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-20 16:56:48,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697931640] [2020-07-20 16:56:48,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:48,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:56:48,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966161929] [2020-07-20 16:56:48,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:48,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:48,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:48,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:48,592 INFO L87 Difference]: Start difference. First operand 166 states and 255 transitions. Second operand 19 states. [2020-07-20 16:56:49,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:49,222 INFO L93 Difference]: Finished difference Result 375 states and 645 transitions. [2020-07-20 16:56:49,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:56:49,222 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 213 [2020-07-20 16:56:49,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:49,225 INFO L225 Difference]: With dead ends: 375 [2020-07-20 16:56:49,226 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 16:56:49,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 396 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=214, Invalid=908, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 16:56:49,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 16:56:49,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 172. [2020-07-20 16:56:49,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 16:56:49,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 275 transitions. [2020-07-20 16:56:49,242 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 275 transitions. Word has length 213 [2020-07-20 16:56:49,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:49,242 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 275 transitions. [2020-07-20 16:56:49,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:49,242 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 275 transitions. [2020-07-20 16:56:49,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-20 16:56:49,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:49,247 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 19, 17, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 9, 8, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:49,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:49,462 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:49,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:49,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1113707265, now seen corresponding path program 11 times [2020-07-20 16:56:49,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:49,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355787947] [2020-07-20 16:56:49,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:49,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:49,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:49,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:49,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:49,882 INFO L134 CoverageAnalysis]: Checked inductivity of 3635 backedges. 2038 proven. 134 refuted. 0 times theorem prover too weak. 1463 trivial. 0 not checked. [2020-07-20 16:56:49,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:51,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,825 INFO L134 CoverageAnalysis]: Checked inductivity of 3635 backedges. 274 proven. 598 refuted. 0 times theorem prover too weak. 2763 trivial. 0 not checked. [2020-07-20 16:56:51,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355787947] [2020-07-20 16:56:51,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:51,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:56:51,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610959243] [2020-07-20 16:56:51,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:51,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:51,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:51,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:51,829 INFO L87 Difference]: Start difference. First operand 172 states and 275 transitions. Second operand 19 states. [2020-07-20 16:56:52,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:52,480 INFO L93 Difference]: Finished difference Result 438 states and 811 transitions. [2020-07-20 16:56:52,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:56:52,481 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 361 [2020-07-20 16:56:52,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:52,484 INFO L225 Difference]: With dead ends: 438 [2020-07-20 16:56:52,484 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 16:56:52,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 735 GetRequests, 691 SyntacticMatches, 13 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=200, Invalid=856, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:56:52,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 16:56:52,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 205. [2020-07-20 16:56:52,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:56:52,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 348 transitions. [2020-07-20 16:56:52,502 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 348 transitions. Word has length 361 [2020-07-20 16:56:52,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:52,503 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 348 transitions. [2020-07-20 16:56:52,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:52,503 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 348 transitions. [2020-07-20 16:56:52,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-20 16:56:52,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:52,507 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 12, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:52,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:52,720 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:52,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:52,720 INFO L82 PathProgramCache]: Analyzing trace with hash 192450495, now seen corresponding path program 12 times [2020-07-20 16:56:52,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:52,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3494852] [2020-07-20 16:56:52,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:52,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:52,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:52,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:52,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:53,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 97 proven. 314 refuted. 0 times theorem prover too weak. 1294 trivial. 0 not checked. [2020-07-20 16:56:53,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:53,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:54,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 97 proven. 324 refuted. 0 times theorem prover too weak. 1284 trivial. 0 not checked. [2020-07-20 16:56:54,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3494852] [2020-07-20 16:56:54,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:54,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:54,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029802481] [2020-07-20 16:56:54,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:54,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:54,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:54,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:54,424 INFO L87 Difference]: Start difference. First operand 205 states and 348 transitions. Second operand 16 states. [2020-07-20 16:56:54,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:54,648 INFO L93 Difference]: Finished difference Result 233 states and 407 transitions. [2020-07-20 16:56:54,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:54,649 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 252 [2020-07-20 16:56:54,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:54,652 INFO L225 Difference]: With dead ends: 233 [2020-07-20 16:56:54,653 INFO L226 Difference]: Without dead ends: 229 [2020-07-20 16:56:54,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 479 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:54,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2020-07-20 16:56:54,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 215. [2020-07-20 16:56:54,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 16:56:54,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 375 transitions. [2020-07-20 16:56:54,671 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 375 transitions. Word has length 252 [2020-07-20 16:56:54,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:54,672 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 375 transitions. [2020-07-20 16:56:54,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:54,672 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 375 transitions. [2020-07-20 16:56:54,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 16:56:54,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:54,676 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 11, 11, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:54,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:54,890 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:54,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:54,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1043096335, now seen corresponding path program 13 times [2020-07-20 16:56:54,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:54,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221272724] [2020-07-20 16:56:54,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:55,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:55,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:55,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:55,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:55,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1687 backedges. 852 proven. 290 refuted. 0 times theorem prover too weak. 545 trivial. 0 not checked. [2020-07-20 16:56:55,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:56,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1687 backedges. 236 proven. 515 refuted. 0 times theorem prover too weak. 936 trivial. 0 not checked. [2020-07-20 16:56:58,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221272724] [2020-07-20 16:56:58,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:58,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:56:58,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005034700] [2020-07-20 16:56:58,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:56:58,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:58,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:56:58,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:56:58,087 INFO L87 Difference]: Start difference. First operand 215 states and 375 transitions. Second operand 25 states. [2020-07-20 16:56:58,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:58,997 INFO L93 Difference]: Finished difference Result 470 states and 915 transitions. [2020-07-20 16:56:58,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:56:58,998 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 249 [2020-07-20 16:56:58,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:59,001 INFO L225 Difference]: With dead ends: 470 [2020-07-20 16:56:59,001 INFO L226 Difference]: Without dead ends: 255 [2020-07-20 16:56:59,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 456 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:56:59,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-20 16:56:59,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 187. [2020-07-20 16:56:59,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 16:56:59,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 300 transitions. [2020-07-20 16:56:59,029 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 300 transitions. Word has length 249 [2020-07-20 16:56:59,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:59,029 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 300 transitions. [2020-07-20 16:56:59,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:56:59,030 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 300 transitions. [2020-07-20 16:56:59,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2020-07-20 16:56:59,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:59,035 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:59,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:59,249 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:59,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:59,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1970797993, now seen corresponding path program 14 times [2020-07-20 16:56:59,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:59,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91049983] [2020-07-20 16:56:59,250 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:59,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:59,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:59,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:59,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:59,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 361 proven. 365 refuted. 0 times theorem prover too weak. 1002 trivial. 0 not checked. [2020-07-20 16:56:59,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:00,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 361 proven. 380 refuted. 0 times theorem prover too weak. 987 trivial. 0 not checked. [2020-07-20 16:57:01,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91049983] [2020-07-20 16:57:01,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:01,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:57:01,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320606653] [2020-07-20 16:57:01,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:57:01,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:01,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:57:01,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:57:01,970 INFO L87 Difference]: Start difference. First operand 187 states and 300 transitions. Second operand 25 states. [2020-07-20 16:57:03,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:03,120 INFO L93 Difference]: Finished difference Result 517 states and 967 transitions. [2020-07-20 16:57:03,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:57:03,120 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 254 [2020-07-20 16:57:03,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:03,124 INFO L225 Difference]: With dead ends: 517 [2020-07-20 16:57:03,124 INFO L226 Difference]: Without dead ends: 302 [2020-07-20 16:57:03,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 465 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=344, Invalid=1726, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:57:03,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-20 16:57:03,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 251. [2020-07-20 16:57:03,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 16:57:03,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 458 transitions. [2020-07-20 16:57:03,146 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 458 transitions. Word has length 254 [2020-07-20 16:57:03,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:03,147 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 458 transitions. [2020-07-20 16:57:03,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:57:03,147 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 458 transitions. [2020-07-20 16:57:03,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-20 16:57:03,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:03,151 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 12, 11, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:03,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:03,367 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:03,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:03,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1129930033, now seen corresponding path program 15 times [2020-07-20 16:57:03,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:03,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690936033] [2020-07-20 16:57:03,368 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:03,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:03,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:03,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:57:03,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:03,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 437 proven. 281 refuted. 0 times theorem prover too weak. 999 trivial. 0 not checked. [2020-07-20 16:57:03,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:04,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 439 proven. 294 refuted. 0 times theorem prover too weak. 984 trivial. 0 not checked. [2020-07-20 16:57:06,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690936033] [2020-07-20 16:57:06,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:06,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:57:06,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145224141] [2020-07-20 16:57:06,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:57:06,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:06,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:57:06,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:57:06,117 INFO L87 Difference]: Start difference. First operand 251 states and 458 transitions. Second operand 25 states. [2020-07-20 16:57:07,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:07,339 INFO L93 Difference]: Finished difference Result 643 states and 1367 transitions. [2020-07-20 16:57:07,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:57:07,340 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 252 [2020-07-20 16:57:07,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:07,348 INFO L225 Difference]: With dead ends: 643 [2020-07-20 16:57:07,348 INFO L226 Difference]: Without dead ends: 342 [2020-07-20 16:57:07,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 461 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:57:07,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-20 16:57:07,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 270. [2020-07-20 16:57:07,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 16:57:07,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 512 transitions. [2020-07-20 16:57:07,399 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 512 transitions. Word has length 252 [2020-07-20 16:57:07,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:07,400 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 512 transitions. [2020-07-20 16:57:07,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:57:07,401 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 512 transitions. [2020-07-20 16:57:07,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2020-07-20 16:57:07,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:07,405 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 13, 12, 11, 11, 11, 11, 11, 11, 11, 10, 9, 9, 9, 9, 9, 9, 9, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:07,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:07,620 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:07,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:07,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1491587273, now seen corresponding path program 16 times [2020-07-20 16:57:07,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:07,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735842686] [2020-07-20 16:57:07,621 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:07,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:07,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:07,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:57:07,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:08,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 474 proven. 273 refuted. 0 times theorem prover too weak. 1369 trivial. 0 not checked. [2020-07-20 16:57:08,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:09,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:10,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:10,250 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 474 proven. 285 refuted. 0 times theorem prover too weak. 1357 trivial. 0 not checked. [2020-07-20 16:57:10,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735842686] [2020-07-20 16:57:10,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:10,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:57:10,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972298387] [2020-07-20 16:57:10,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:57:10,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:10,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:57:10,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:10,253 INFO L87 Difference]: Start difference. First operand 270 states and 512 transitions. Second operand 23 states. [2020-07-20 16:57:11,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:11,284 INFO L93 Difference]: Finished difference Result 677 states and 1542 transitions. [2020-07-20 16:57:11,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:57:11,285 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 278 [2020-07-20 16:57:11,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:11,290 INFO L225 Difference]: With dead ends: 677 [2020-07-20 16:57:11,290 INFO L226 Difference]: Without dead ends: 374 [2020-07-20 16:57:11,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 517 SyntacticMatches, 17 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=302, Invalid=1420, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 16:57:11,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2020-07-20 16:57:11,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 270. [2020-07-20 16:57:11,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 16:57:11,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 512 transitions. [2020-07-20 16:57:11,320 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 512 transitions. Word has length 278 [2020-07-20 16:57:11,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:11,321 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 512 transitions. [2020-07-20 16:57:11,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:57:11,321 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 512 transitions. [2020-07-20 16:57:11,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2020-07-20 16:57:11,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:11,325 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:11,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:11,540 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:11,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:11,541 INFO L82 PathProgramCache]: Analyzing trace with hash -1025098094, now seen corresponding path program 4 times [2020-07-20 16:57:11,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:11,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775313297] [2020-07-20 16:57:11,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:11,786 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:11,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:11,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:57:11,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:11,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1476 backedges. 85 proven. 407 refuted. 0 times theorem prover too weak. 984 trivial. 0 not checked. [2020-07-20 16:57:11,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:13,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:13,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:13,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1476 backedges. 85 proven. 428 refuted. 0 times theorem prover too weak. 963 trivial. 0 not checked. [2020-07-20 16:57:14,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775313297] [2020-07-20 16:57:14,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:14,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:57:14,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049267913] [2020-07-20 16:57:14,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:57:14,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:14,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:57:14,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:57:14,448 INFO L87 Difference]: Start difference. First operand 270 states and 512 transitions. Second operand 20 states. [2020-07-20 16:57:14,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:14,772 INFO L93 Difference]: Finished difference Result 287 states and 561 transitions. [2020-07-20 16:57:14,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:57:14,773 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 234 [2020-07-20 16:57:14,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:14,779 INFO L225 Difference]: With dead ends: 287 [2020-07-20 16:57:14,779 INFO L226 Difference]: Without dead ends: 283 [2020-07-20 16:57:14,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 437 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:57:14,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-20 16:57:14,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 225. [2020-07-20 16:57:14,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-07-20 16:57:14,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 397 transitions. [2020-07-20 16:57:14,801 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 397 transitions. Word has length 234 [2020-07-20 16:57:14,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:14,801 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 397 transitions. [2020-07-20 16:57:14,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:57:14,802 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 397 transitions. [2020-07-20 16:57:14,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 447 [2020-07-20 16:57:14,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:14,807 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 25, 24, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 10, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:15,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:15,020 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:15,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:15,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1461916829, now seen corresponding path program 17 times [2020-07-20 16:57:15,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:15,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089671527] [2020-07-20 16:57:15,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:15,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:57:15,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:15,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:57:15,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:15,588 INFO L134 CoverageAnalysis]: Checked inductivity of 5644 backedges. 2884 proven. 736 refuted. 0 times theorem prover too weak. 2024 trivial. 0 not checked. [2020-07-20 16:57:15,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:18,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:18,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:18,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:20,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5644 backedges. 424 proven. 1416 refuted. 0 times theorem prover too weak. 3804 trivial. 0 not checked. [2020-07-20 16:57:20,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089671527] [2020-07-20 16:57:20,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:20,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-20 16:57:20,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100702517] [2020-07-20 16:57:20,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:57:20,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:20,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:57:20,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:57:20,489 INFO L87 Difference]: Start difference. First operand 225 states and 397 transitions. Second operand 31 states. [2020-07-20 16:57:22,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:22,257 INFO L93 Difference]: Finished difference Result 569 states and 1171 transitions. [2020-07-20 16:57:22,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 16:57:22,258 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 446 [2020-07-20 16:57:22,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:22,263 INFO L225 Difference]: With dead ends: 569 [2020-07-20 16:57:22,263 INFO L226 Difference]: Without dead ends: 350 [2020-07-20 16:57:22,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 841 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=496, Invalid=2696, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 16:57:22,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2020-07-20 16:57:22,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 298. [2020-07-20 16:57:22,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2020-07-20 16:57:22,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 542 transitions. [2020-07-20 16:57:22,290 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 542 transitions. Word has length 446 [2020-07-20 16:57:22,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:22,290 INFO L479 AbstractCegarLoop]: Abstraction has 298 states and 542 transitions. [2020-07-20 16:57:22,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:57:22,290 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 542 transitions. [2020-07-20 16:57:22,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-20 16:57:22,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:22,294 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 15, 15, 13, 12, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:22,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:22,510 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:22,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:22,511 INFO L82 PathProgramCache]: Analyzing trace with hash -961725027, now seen corresponding path program 18 times [2020-07-20 16:57:22,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:22,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280881873] [2020-07-20 16:57:22,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:22,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:22,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:22,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:57:22,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:22,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 809 proven. 174 refuted. 0 times theorem prover too weak. 421 trivial. 0 not checked. [2020-07-20 16:57:22,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:24,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:24,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:25,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 194 proven. 422 refuted. 0 times theorem prover too weak. 788 trivial. 0 not checked. [2020-07-20 16:57:25,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280881873] [2020-07-20 16:57:25,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:25,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:57:25,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574111645] [2020-07-20 16:57:25,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:57:25,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:25,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:57:25,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:25,426 INFO L87 Difference]: Start difference. First operand 298 states and 542 transitions. Second operand 23 states. [2020-07-20 16:57:26,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:26,202 INFO L93 Difference]: Finished difference Result 611 states and 1178 transitions. [2020-07-20 16:57:26,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:57:26,203 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 230 [2020-07-20 16:57:26,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:26,207 INFO L225 Difference]: With dead ends: 611 [2020-07-20 16:57:26,207 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 16:57:26,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 421 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=236, Invalid=1096, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:57:26,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 16:57:26,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 304. [2020-07-20 16:57:26,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 16:57:26,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 552 transitions. [2020-07-20 16:57:26,230 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 552 transitions. Word has length 230 [2020-07-20 16:57:26,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:26,230 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 552 transitions. [2020-07-20 16:57:26,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:57:26,230 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 552 transitions. [2020-07-20 16:57:26,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2020-07-20 16:57:26,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:26,236 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 27, 27, 22, 21, 16, 16, 16, 16, 16, 16, 16, 13, 13, 13, 13, 13, 13, 13, 10, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:26,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:26,450 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:26,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:26,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1665470626, now seen corresponding path program 19 times [2020-07-20 16:57:26,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:26,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671314352] [2020-07-20 16:57:26,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:26,791 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:26,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:26,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:57:26,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:27,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4621 backedges. 2589 proven. 207 refuted. 0 times theorem prover too weak. 1825 trivial. 0 not checked. [2020-07-20 16:57:27,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:29,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:30,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4621 backedges. 323 proven. 928 refuted. 0 times theorem prover too weak. 3370 trivial. 0 not checked. [2020-07-20 16:57:30,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671314352] [2020-07-20 16:57:30,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:30,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:57:30,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792687349] [2020-07-20 16:57:30,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:57:30,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:30,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:57:30,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:30,069 INFO L87 Difference]: Start difference. First operand 304 states and 552 transitions. Second operand 23 states. [2020-07-20 16:57:30,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:30,838 INFO L93 Difference]: Finished difference Result 617 states and 1141 transitions. [2020-07-20 16:57:30,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:57:30,840 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 404 [2020-07-20 16:57:30,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:30,845 INFO L225 Difference]: With dead ends: 617 [2020-07-20 16:57:30,845 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 16:57:30,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 821 GetRequests, 769 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:57:30,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 16:57:30,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 299. [2020-07-20 16:57:30,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2020-07-20 16:57:30,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 530 transitions. [2020-07-20 16:57:30,873 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 530 transitions. Word has length 404 [2020-07-20 16:57:30,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:30,874 INFO L479 AbstractCegarLoop]: Abstraction has 299 states and 530 transitions. [2020-07-20 16:57:30,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:57:30,874 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 530 transitions. [2020-07-20 16:57:30,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 16:57:30,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:30,881 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 17, 16, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:31,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:31,098 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:31,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:31,098 INFO L82 PathProgramCache]: Analyzing trace with hash 837790271, now seen corresponding path program 20 times [2020-07-20 16:57:31,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:31,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635649445] [2020-07-20 16:57:31,099 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:31,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:31,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:31,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:57:31,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:31,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 105 proven. 613 refuted. 0 times theorem prover too weak. 1914 trivial. 0 not checked. [2020-07-20 16:57:31,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:33,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:33,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:34,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 105 proven. 637 refuted. 0 times theorem prover too weak. 1890 trivial. 0 not checked. [2020-07-20 16:57:34,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635649445] [2020-07-20 16:57:34,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:34,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 16:57:34,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043308751] [2020-07-20 16:57:34,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:57:34,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:34,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:57:34,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:57:34,600 INFO L87 Difference]: Start difference. First operand 299 states and 530 transitions. Second operand 19 states. [2020-07-20 16:57:34,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:34,930 INFO L93 Difference]: Finished difference Result 323 states and 582 transitions. [2020-07-20 16:57:34,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:57:34,931 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 310 [2020-07-20 16:57:34,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:34,935 INFO L225 Difference]: With dead ends: 323 [2020-07-20 16:57:34,935 INFO L226 Difference]: Without dead ends: 319 [2020-07-20 16:57:34,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 587 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:57:34,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2020-07-20 16:57:34,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 308. [2020-07-20 16:57:34,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-20 16:57:34,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 544 transitions. [2020-07-20 16:57:34,957 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 544 transitions. Word has length 310 [2020-07-20 16:57:34,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:34,958 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 544 transitions. [2020-07-20 16:57:34,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:57:34,958 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 544 transitions. [2020-07-20 16:57:34,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 16:57:34,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:34,962 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 21, 21, 17, 16, 12, 12, 12, 12, 12, 12, 12, 10, 10, 10, 10, 10, 10, 10, 8, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:35,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:35,177 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:35,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:35,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1449609713, now seen corresponding path program 21 times [2020-07-20 16:57:35,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:35,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689919338] [2020-07-20 16:57:35,179 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:35,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:35,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:35,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:57:35,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:35,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 140 proven. 488 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2020-07-20 16:57:35,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:36,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:36,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:37,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 140 proven. 504 refuted. 0 times theorem prover too weak. 2000 trivial. 0 not checked. [2020-07-20 16:57:37,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689919338] [2020-07-20 16:57:37,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:37,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:57:37,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570395327] [2020-07-20 16:57:37,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:57:37,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:37,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:57:37,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:57:37,896 INFO L87 Difference]: Start difference. First operand 308 states and 544 transitions. Second operand 17 states. [2020-07-20 16:57:38,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:38,169 INFO L93 Difference]: Finished difference Result 371 states and 713 transitions. [2020-07-20 16:57:38,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:57:38,169 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 310 [2020-07-20 16:57:38,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:38,174 INFO L225 Difference]: With dead ends: 371 [2020-07-20 16:57:38,174 INFO L226 Difference]: Without dead ends: 367 [2020-07-20 16:57:38,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 591 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:38,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2020-07-20 16:57:38,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 318. [2020-07-20 16:57:38,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 16:57:38,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 567 transitions. [2020-07-20 16:57:38,196 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 567 transitions. Word has length 310 [2020-07-20 16:57:38,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:38,196 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 567 transitions. [2020-07-20 16:57:38,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:57:38,196 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 567 transitions. [2020-07-20 16:57:38,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 16:57:38,200 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:38,200 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 21, 21, 14, 14, 12, 12, 12, 12, 12, 12, 12, 10, 10, 10, 10, 10, 10, 10, 10, 7, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:38,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:38,415 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:38,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:38,416 INFO L82 PathProgramCache]: Analyzing trace with hash 49680215, now seen corresponding path program 22 times [2020-07-20 16:57:38,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:38,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995474316] [2020-07-20 16:57:38,417 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:38,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:38,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:38,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:57:38,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:38,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2570 backedges. 537 proven. 462 refuted. 0 times theorem prover too weak. 1571 trivial. 0 not checked. [2020-07-20 16:57:38,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:40,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:41,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:42,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:42,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2570 backedges. 539 proven. 478 refuted. 0 times theorem prover too weak. 1553 trivial. 0 not checked. [2020-07-20 16:57:42,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995474316] [2020-07-20 16:57:42,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:42,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:57:42,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009096842] [2020-07-20 16:57:42,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:57:42,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:42,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:57:42,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:57:42,184 INFO L87 Difference]: Start difference. First operand 318 states and 567 transitions. Second operand 27 states. [2020-07-20 16:57:43,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:43,396 INFO L93 Difference]: Finished difference Result 692 states and 1308 transitions. [2020-07-20 16:57:43,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:57:43,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 305 [2020-07-20 16:57:43,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:43,402 INFO L225 Difference]: With dead ends: 692 [2020-07-20 16:57:43,402 INFO L226 Difference]: Without dead ends: 358 [2020-07-20 16:57:43,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 627 GetRequests, 563 SyntacticMatches, 21 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=312, Invalid=1668, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 16:57:43,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2020-07-20 16:57:43,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 331. [2020-07-20 16:57:43,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2020-07-20 16:57:43,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 609 transitions. [2020-07-20 16:57:43,428 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 609 transitions. Word has length 305 [2020-07-20 16:57:43,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:43,428 INFO L479 AbstractCegarLoop]: Abstraction has 331 states and 609 transitions. [2020-07-20 16:57:43,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:57:43,428 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 609 transitions. [2020-07-20 16:57:43,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-20 16:57:43,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:43,434 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 27, 27, 21, 20, 17, 17, 17, 17, 17, 17, 17, 14, 13, 13, 13, 13, 13, 13, 13, 7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:43,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:43,648 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:43,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:43,649 INFO L82 PathProgramCache]: Analyzing trace with hash 2084379139, now seen corresponding path program 23 times [2020-07-20 16:57:43,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:43,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192646448] [2020-07-20 16:57:43,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:44,050 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:44,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:44,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:57:44,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:44,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4904 backedges. 625 proven. 851 refuted. 0 times theorem prover too weak. 3428 trivial. 0 not checked. [2020-07-20 16:57:44,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:46,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:47,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:48,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4904 backedges. 627 proven. 869 refuted. 0 times theorem prover too weak. 3408 trivial. 0 not checked. [2020-07-20 16:57:48,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192646448] [2020-07-20 16:57:48,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:48,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:57:48,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524178902] [2020-07-20 16:57:48,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:57:48,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:48,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:57:48,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:57:48,166 INFO L87 Difference]: Start difference. First operand 331 states and 609 transitions. Second operand 27 states. [2020-07-20 16:57:49,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:49,581 INFO L93 Difference]: Finished difference Result 805 states and 1630 transitions. [2020-07-20 16:57:49,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:57:49,583 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 414 [2020-07-20 16:57:49,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:49,589 INFO L225 Difference]: With dead ends: 805 [2020-07-20 16:57:49,589 INFO L226 Difference]: Without dead ends: 448 [2020-07-20 16:57:49,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 781 SyntacticMatches, 21 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=390, Invalid=1962, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:57:49,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-20 16:57:49,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 400. [2020-07-20 16:57:49,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 16:57:49,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 752 transitions. [2020-07-20 16:57:49,624 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 752 transitions. Word has length 414 [2020-07-20 16:57:49,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:49,625 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 752 transitions. [2020-07-20 16:57:49,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:57:49,625 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 752 transitions. [2020-07-20 16:57:49,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-20 16:57:49,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:49,631 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 17, 16, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 10, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:49,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:49,845 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:49,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:49,845 INFO L82 PathProgramCache]: Analyzing trace with hash 320634068, now seen corresponding path program 24 times [2020-07-20 16:57:49,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:49,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116199549] [2020-07-20 16:57:49,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:50,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:50,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:50,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:57:50,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:50,394 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 182 proven. 528 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-20 16:57:50,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:51,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 182 proven. 544 refuted. 0 times theorem prover too weak. 2606 trivial. 0 not checked. [2020-07-20 16:57:52,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116199549] [2020-07-20 16:57:52,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:52,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:57:52,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65659534] [2020-07-20 16:57:52,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:57:52,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:52,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:57:52,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:57:52,841 INFO L87 Difference]: Start difference. First operand 400 states and 752 transitions. Second operand 17 states. [2020-07-20 16:57:53,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:53,149 INFO L93 Difference]: Finished difference Result 418 states and 778 transitions. [2020-07-20 16:57:53,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:57:53,150 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 346 [2020-07-20 16:57:53,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:53,156 INFO L225 Difference]: With dead ends: 418 [2020-07-20 16:57:53,156 INFO L226 Difference]: Without dead ends: 414 [2020-07-20 16:57:53,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 663 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:53,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-20 16:57:53,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 385. [2020-07-20 16:57:53,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 385 states. [2020-07-20 16:57:53,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 712 transitions. [2020-07-20 16:57:53,185 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 712 transitions. Word has length 346 [2020-07-20 16:57:53,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:53,185 INFO L479 AbstractCegarLoop]: Abstraction has 385 states and 712 transitions. [2020-07-20 16:57:53,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:57:53,185 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 712 transitions. [2020-07-20 16:57:53,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-20 16:57:53,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:53,191 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:53,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:53,406 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:53,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:53,407 INFO L82 PathProgramCache]: Analyzing trace with hash -884966346, now seen corresponding path program 25 times [2020-07-20 16:57:53,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:53,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507122883] [2020-07-20 16:57:53,408 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:53,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:53,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:53,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:57:53,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:54,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 247 proven. 519 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-20 16:57:54,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:55,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:55,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:55,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:55,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:56,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 249 proven. 533 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-20 16:57:56,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507122883] [2020-07-20 16:57:56,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:56,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:57:56,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597724993] [2020-07-20 16:57:56,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:57:56,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:56,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:57:56,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:57:56,619 INFO L87 Difference]: Start difference. First operand 385 states and 712 transitions. Second operand 17 states. [2020-07-20 16:57:56,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:56,901 INFO L93 Difference]: Finished difference Result 405 states and 763 transitions. [2020-07-20 16:57:56,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:57:56,902 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 370 [2020-07-20 16:57:56,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:56,907 INFO L225 Difference]: With dead ends: 405 [2020-07-20 16:57:56,907 INFO L226 Difference]: Without dead ends: 401 [2020-07-20 16:57:56,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:56,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-20 16:57:56,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 378. [2020-07-20 16:57:56,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2020-07-20 16:57:56,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 696 transitions. [2020-07-20 16:57:56,934 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 696 transitions. Word has length 370 [2020-07-20 16:57:56,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:56,935 INFO L479 AbstractCegarLoop]: Abstraction has 378 states and 696 transitions. [2020-07-20 16:57:56,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:57:56,935 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 696 transitions. [2020-07-20 16:57:56,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 16:57:56,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:56,942 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 26, 25, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 11, 11, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:57,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:57,157 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:57,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:57,157 INFO L82 PathProgramCache]: Analyzing trace with hash -763533827, now seen corresponding path program 26 times [2020-07-20 16:57:57,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:57,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643586001] [2020-07-20 16:57:57,158 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:57,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:57:57,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:57,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:57:57,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:58,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7033 backedges. 3471 proven. 177 refuted. 0 times theorem prover too weak. 3385 trivial. 0 not checked. [2020-07-20 16:57:58,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:01,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:02,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:02,186 INFO L134 CoverageAnalysis]: Checked inductivity of 7033 backedges. 410 proven. 1259 refuted. 0 times theorem prover too weak. 5364 trivial. 0 not checked. [2020-07-20 16:58:02,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643586001] [2020-07-20 16:58:02,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:02,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:58:02,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141872314] [2020-07-20 16:58:02,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:58:02,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:02,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:58:02,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:58:02,189 INFO L87 Difference]: Start difference. First operand 378 states and 696 transitions. Second operand 23 states. [2020-07-20 16:58:03,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:03,044 INFO L93 Difference]: Finished difference Result 749 states and 1431 transitions. [2020-07-20 16:58:03,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:58:03,045 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 496 [2020-07-20 16:58:03,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:03,049 INFO L225 Difference]: With dead ends: 749 [2020-07-20 16:58:03,049 INFO L226 Difference]: Without dead ends: 371 [2020-07-20 16:58:03,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1005 GetRequests, 953 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:58:03,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2020-07-20 16:58:03,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 337. [2020-07-20 16:58:03,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-07-20 16:58:03,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 568 transitions. [2020-07-20 16:58:03,072 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 568 transitions. Word has length 496 [2020-07-20 16:58:03,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:03,072 INFO L479 AbstractCegarLoop]: Abstraction has 337 states and 568 transitions. [2020-07-20 16:58:03,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:58:03,073 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 568 transitions. [2020-07-20 16:58:03,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 539 [2020-07-20 16:58:03,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:03,079 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 36, 36, 29, 28, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 14, 11, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:03,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:03,293 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:03,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:03,293 INFO L82 PathProgramCache]: Analyzing trace with hash -2076572630, now seen corresponding path program 27 times [2020-07-20 16:58:03,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:03,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562539058] [2020-07-20 16:58:03,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:03,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:03,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:03,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 804 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:58:03,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:04,095 INFO L134 CoverageAnalysis]: Checked inductivity of 8368 backedges. 4705 proven. 400 refuted. 0 times theorem prover too weak. 3263 trivial. 0 not checked. [2020-07-20 16:58:04,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:06,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:06,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:06,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:07,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,594 INFO L134 CoverageAnalysis]: Checked inductivity of 8368 backedges. 565 proven. 1371 refuted. 0 times theorem prover too weak. 6432 trivial. 0 not checked. [2020-07-20 16:58:08,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562539058] [2020-07-20 16:58:08,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:08,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:58:08,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105546337] [2020-07-20 16:58:08,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:58:08,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:08,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:58:08,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:58:08,597 INFO L87 Difference]: Start difference. First operand 337 states and 568 transitions. Second operand 25 states. [2020-07-20 16:58:09,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:09,791 INFO L93 Difference]: Finished difference Result 715 states and 1228 transitions. [2020-07-20 16:58:09,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:58:09,792 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 538 [2020-07-20 16:58:09,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:09,797 INFO L225 Difference]: With dead ends: 715 [2020-07-20 16:58:09,797 INFO L226 Difference]: Without dead ends: 380 [2020-07-20 16:58:09,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1091 GetRequests, 1033 SyntacticMatches, 19 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=272, Invalid=1368, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 16:58:09,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2020-07-20 16:58:09,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 352. [2020-07-20 16:58:09,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 16:58:09,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 594 transitions. [2020-07-20 16:58:09,822 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 594 transitions. Word has length 538 [2020-07-20 16:58:09,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:09,822 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 594 transitions. [2020-07-20 16:58:09,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:58:09,822 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 594 transitions. [2020-07-20 16:58:09,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-07-20 16:58:09,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:09,828 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 23, 23, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:10,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:10,042 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:10,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:10,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1231200963, now seen corresponding path program 28 times [2020-07-20 16:58:10,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:10,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676981978] [2020-07-20 16:58:10,043 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:10,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:10,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:10,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:58:10,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:10,868 INFO L134 CoverageAnalysis]: Checked inductivity of 5562 backedges. 762 proven. 1079 refuted. 0 times theorem prover too weak. 3721 trivial. 0 not checked. [2020-07-20 16:58:10,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:12,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:16,558 INFO L134 CoverageAnalysis]: Checked inductivity of 5562 backedges. 762 proven. 1113 refuted. 0 times theorem prover too weak. 3687 trivial. 0 not checked. [2020-07-20 16:58:16,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676981978] [2020-07-20 16:58:16,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:16,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:58:16,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018301144] [2020-07-20 16:58:16,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:58:16,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:16,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:58:16,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:58:16,561 INFO L87 Difference]: Start difference. First operand 352 states and 594 transitions. Second operand 31 states. [2020-07-20 16:58:18,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:18,378 INFO L93 Difference]: Finished difference Result 763 states and 1376 transitions. [2020-07-20 16:58:18,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 16:58:18,379 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 443 [2020-07-20 16:58:18,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:18,387 INFO L225 Difference]: With dead ends: 763 [2020-07-20 16:58:18,387 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 16:58:18,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 909 GetRequests, 831 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=468, Invalid=2502, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:58:18,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 16:58:18,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 380. [2020-07-20 16:58:18,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-20 16:58:18,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 692 transitions. [2020-07-20 16:58:18,417 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 692 transitions. Word has length 443 [2020-07-20 16:58:18,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:18,418 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 692 transitions. [2020-07-20 16:58:18,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:58:18,418 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 692 transitions. [2020-07-20 16:58:18,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 16:58:18,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:18,425 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 36, 36, 23, 23, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 16, 13, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:18,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:18,640 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:18,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:18,640 INFO L82 PathProgramCache]: Analyzing trace with hash 905610940, now seen corresponding path program 29 times [2020-07-20 16:58:18,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:18,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44316226] [2020-07-20 16:58:18,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:19,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:19,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:19,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:58:19,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:19,536 INFO L134 CoverageAnalysis]: Checked inductivity of 7286 backedges. 1056 proven. 1078 refuted. 0 times theorem prover too weak. 5152 trivial. 0 not checked. [2020-07-20 16:58:19,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:21,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:22,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:24,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,330 INFO L134 CoverageAnalysis]: Checked inductivity of 7286 backedges. 1060 proven. 1104 refuted. 0 times theorem prover too weak. 5122 trivial. 0 not checked. [2020-07-20 16:58:25,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44316226] [2020-07-20 16:58:25,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:25,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:58:25,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024493390] [2020-07-20 16:58:25,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:58:25,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:25,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:58:25,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:58:25,332 INFO L87 Difference]: Start difference. First operand 380 states and 692 transitions. Second operand 31 states. [2020-07-20 16:58:27,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:27,004 INFO L93 Difference]: Finished difference Result 781 states and 1444 transitions. [2020-07-20 16:58:27,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:58:27,005 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 503 [2020-07-20 16:58:27,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:27,011 INFO L225 Difference]: With dead ends: 781 [2020-07-20 16:58:27,011 INFO L226 Difference]: Without dead ends: 399 [2020-07-20 16:58:27,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 951 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=437, Invalid=2425, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:58:27,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2020-07-20 16:58:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 357. [2020-07-20 16:58:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2020-07-20 16:58:27,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 603 transitions. [2020-07-20 16:58:27,077 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 603 transitions. Word has length 503 [2020-07-20 16:58:27,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:27,077 INFO L479 AbstractCegarLoop]: Abstraction has 357 states and 603 transitions. [2020-07-20 16:58:27,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:58:27,077 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 603 transitions. [2020-07-20 16:58:27,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 669 [2020-07-20 16:58:27,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:27,089 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 34, 33, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 16, 16, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:27,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:27,296 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:27,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:27,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1590339038, now seen corresponding path program 30 times [2020-07-20 16:58:27,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:27,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451402215] [2020-07-20 16:58:27,299 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:27,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:27,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:27,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:58:27,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 12997 backedges. 1086 proven. 2119 refuted. 0 times theorem prover too weak. 9792 trivial. 0 not checked. [2020-07-20 16:58:28,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:31,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:31,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:31,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:31,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:32,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:34,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:34,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:35,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:35,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:35,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:35,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,264 INFO L134 CoverageAnalysis]: Checked inductivity of 12997 backedges. 1090 proven. 2155 refuted. 0 times theorem prover too weak. 9752 trivial. 0 not checked. [2020-07-20 16:58:36,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451402215] [2020-07-20 16:58:36,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:36,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:58:36,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956166104] [2020-07-20 16:58:36,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:58:36,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:36,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:58:36,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:58:36,267 INFO L87 Difference]: Start difference. First operand 357 states and 603 transitions. Second operand 33 states. [2020-07-20 16:58:38,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:38,688 INFO L93 Difference]: Finished difference Result 918 states and 1768 transitions. [2020-07-20 16:58:38,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 16:58:38,689 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 668 [2020-07-20 16:58:38,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:38,696 INFO L225 Difference]: With dead ends: 918 [2020-07-20 16:58:38,696 INFO L226 Difference]: Without dead ends: 528 [2020-07-20 16:58:38,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1277 SyntacticMatches, 27 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 843 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=595, Invalid=3311, Unknown=0, NotChecked=0, Total=3906 [2020-07-20 16:58:38,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2020-07-20 16:58:38,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 441. [2020-07-20 16:58:38,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441 states. [2020-07-20 16:58:38,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 767 transitions. [2020-07-20 16:58:38,722 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 767 transitions. Word has length 668 [2020-07-20 16:58:38,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:38,723 INFO L479 AbstractCegarLoop]: Abstraction has 441 states and 767 transitions. [2020-07-20 16:58:38,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:58:38,723 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 767 transitions. [2020-07-20 16:58:38,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-20 16:58:38,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:38,730 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 27, 27, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 15, 14, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:38,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:38,932 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:38,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:38,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1686345566, now seen corresponding path program 31 times [2020-07-20 16:58:38,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:38,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448254084] [2020-07-20 16:58:38,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:39,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:58:39,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:39,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:58:39,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:39,865 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 3483 proven. 154 refuted. 0 times theorem prover too weak. 5389 trivial. 0 not checked. [2020-07-20 16:58:39,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:43,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 363 proven. 1552 refuted. 0 times theorem prover too weak. 7111 trivial. 0 not checked. [2020-07-20 16:58:44,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448254084] [2020-07-20 16:58:44,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:44,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 16:58:44,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901728078] [2020-07-20 16:58:44,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:58:44,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:44,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:58:44,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:58:44,798 INFO L87 Difference]: Start difference. First operand 441 states and 767 transitions. Second operand 23 states. [2020-07-20 16:58:45,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:45,905 INFO L93 Difference]: Finished difference Result 893 states and 1696 transitions. [2020-07-20 16:58:45,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:58:45,907 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 559 [2020-07-20 16:58:45,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:45,914 INFO L225 Difference]: With dead ends: 893 [2020-07-20 16:58:45,914 INFO L226 Difference]: Without dead ends: 457 [2020-07-20 16:58:45,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 1081 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:58:45,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2020-07-20 16:58:45,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 439. [2020-07-20 16:58:45,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 439 states. [2020-07-20 16:58:45,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 736 transitions. [2020-07-20 16:58:45,943 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 736 transitions. Word has length 559 [2020-07-20 16:58:45,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:45,943 INFO L479 AbstractCegarLoop]: Abstraction has 439 states and 736 transitions. [2020-07-20 16:58:45,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:58:45,943 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 736 transitions. [2020-07-20 16:58:45,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 16:58:45,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:45,950 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 27, 27, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:46,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:46,156 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:46,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:46,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1737567509, now seen corresponding path program 32 times [2020-07-20 16:58:46,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:46,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070447955] [2020-07-20 16:58:46,158 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:46,803 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:58:46,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:46,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 964 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 16:58:46,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:47,109 INFO L134 CoverageAnalysis]: Checked inductivity of 7110 backedges. 3723 proven. 336 refuted. 0 times theorem prover too weak. 3051 trivial. 0 not checked. [2020-07-20 16:58:47,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:50,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 7110 backedges. 401 proven. 1519 refuted. 0 times theorem prover too weak. 5190 trivial. 0 not checked. [2020-07-20 16:58:52,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070447955] [2020-07-20 16:58:52,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:52,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-20 16:58:52,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612913889] [2020-07-20 16:58:52,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:58:52,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:52,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:58:52,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:58:52,747 INFO L87 Difference]: Start difference. First operand 439 states and 736 transitions. Second operand 27 states. [2020-07-20 16:58:54,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:54,253 INFO L93 Difference]: Finished difference Result 899 states and 1546 transitions. [2020-07-20 16:58:54,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:58:54,255 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 499 [2020-07-20 16:58:54,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:54,260 INFO L225 Difference]: With dead ends: 899 [2020-07-20 16:58:54,260 INFO L226 Difference]: Without dead ends: 465 [2020-07-20 16:58:54,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 953 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=386, Invalid=1870, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 16:58:54,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2020-07-20 16:58:54,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 429. [2020-07-20 16:58:54,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 429 states. [2020-07-20 16:58:54,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 701 transitions. [2020-07-20 16:58:54,290 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 701 transitions. Word has length 499 [2020-07-20 16:58:54,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:54,290 INFO L479 AbstractCegarLoop]: Abstraction has 429 states and 701 transitions. [2020-07-20 16:58:54,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:58:54,291 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 701 transitions. [2020-07-20 16:58:54,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 16:58:54,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:54,297 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:54,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:54,511 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:54,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:54,511 INFO L82 PathProgramCache]: Analyzing trace with hash -582108663, now seen corresponding path program 33 times [2020-07-20 16:58:54,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:54,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296217137] [2020-07-20 16:58:54,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:55,241 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:58:55,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:55,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 140 conjunts are in the unsatisfiable core [2020-07-20 16:58:55,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 1153 proven. 1062 refuted. 0 times theorem prover too weak. 4199 trivial. 0 not checked. [2020-07-20 16:58:56,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:57,168 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:58:57,272 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:58:57,382 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:58:57,490 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:58:58,224 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:58:58,442 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:58:58,666 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:58:58,878 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:58:59,903 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:00,007 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:00,114 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:00,561 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification that was a NOOP. DAG size: 185 [2020-07-20 16:59:01,015 WARN L193 SmtUtils]: Spent 451.00 ms on a formula simplification that was a NOOP. DAG size: 185 [2020-07-20 16:59:01,485 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 16:59:01,950 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 16:59:02,808 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:02,912 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:03,020 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:03,126 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:04,135 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 16:59:04,378 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 16:59:04,632 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 16:59:04,882 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 16:59:06,033 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 311 [2020-07-20 16:59:07,158 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 311 [2020-07-20 16:59:08,283 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 313 [2020-07-20 16:59:09,425 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 313 [2020-07-20 16:59:10,418 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:10,526 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:10,643 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:10,809 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:11,893 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 16:59:12,151 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 16:59:12,425 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 16:59:12,674 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 16:59:12,936 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-20 16:59:13,186 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 175 [2020-07-20 16:59:13,430 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 16:59:13,663 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2020-07-20 16:59:13,886 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 165 [2020-07-20 16:59:14,104 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 161 [2020-07-20 16:59:14,310 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-20 16:59:14,523 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2020-07-20 16:59:14,749 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2020-07-20 16:59:14,965 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-20 16:59:15,175 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 141 [2020-07-20 16:59:15,370 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2020-07-20 16:59:15,548 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 135 [2020-07-20 16:59:15,724 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-20 16:59:15,906 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2020-07-20 16:59:16,068 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-20 16:59:16,229 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 121 [2020-07-20 16:59:16,383 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-20 16:59:16,533 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:59:16,678 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 111 [2020-07-20 16:59:16,818 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2020-07-20 16:59:16,952 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2020-07-20 16:59:17,088 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 101 [2020-07-20 16:59:17,221 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 16:59:17,350 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 16:59:17,467 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:59:17,581 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 16:59:17,688 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:59:17,843 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 16:59:23,020 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:23,136 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:23,255 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:23,382 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:26,545 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:26,663 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:26,794 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:26,922 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:27,826 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:59:28,127 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:59:28,387 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:59:28,644 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:59:29,275 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:59:29,769 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:29,894 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:30,028 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:30,155 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:30,679 WARN L193 SmtUtils]: Spent 519.00 ms on a formula simplification that was a NOOP. DAG size: 185 [2020-07-20 16:59:31,196 WARN L193 SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 185 [2020-07-20 16:59:31,724 WARN L193 SmtUtils]: Spent 522.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 16:59:32,253 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 16:59:33,430 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:33,558 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:33,693 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:33,828 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:33,970 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 16:59:34,099 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 16:59:34,218 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 16:59:34,340 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-20 16:59:34,452 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 16:59:34,563 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:59:39,147 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:39,275 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:39,415 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:39,553 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:40,540 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:59:40,797 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-20 16:59:41,069 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:59:41,344 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2020-07-20 16:59:42,153 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:59:42,261 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:59:42,365 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:59:42,475 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:59:45,097 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:45,232 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:59:45,372 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:45,515 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:59:48,200 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 1153 proven. 1056 refuted. 0 times theorem prover too weak. 4205 trivial. 0 not checked. [2020-07-20 16:59:48,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296217137] [2020-07-20 16:59:48,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:48,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 59 [2020-07-20 16:59:48,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305393264] [2020-07-20 16:59:48,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 16:59:48,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:48,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 16:59:48,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=3025, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 16:59:48,202 INFO L87 Difference]: Start difference. First operand 429 states and 701 transitions. Second operand 59 states. [2020-07-20 16:59:52,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:52,016 INFO L93 Difference]: Finished difference Result 729 states and 1611 transitions. [2020-07-20 16:59:52,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2020-07-20 16:59:52,019 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 475 [2020-07-20 16:59:52,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:52,031 INFO L225 Difference]: With dead ends: 729 [2020-07-20 16:59:52,031 INFO L226 Difference]: Without dead ends: 725 [2020-07-20 16:59:52,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 993 GetRequests, 787 SyntacticMatches, 105 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7752 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1352, Invalid=9154, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 16:59:52,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 725 states. [2020-07-20 16:59:52,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 725 to 603. [2020-07-20 16:59:52,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 603 states. [2020-07-20 16:59:52,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 1406 transitions. [2020-07-20 16:59:52,069 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 1406 transitions. Word has length 475 [2020-07-20 16:59:52,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:52,070 INFO L479 AbstractCegarLoop]: Abstraction has 603 states and 1406 transitions. [2020-07-20 16:59:52,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 16:59:52,070 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 1406 transitions. [2020-07-20 16:59:52,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-20 16:59:52,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:52,080 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 38, 38, 30, 29, 25, 25, 25, 25, 25, 25, 25, 22, 19, 19, 19, 19, 19, 19, 19, 10, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:52,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:52,281 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:52,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:52,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1592859357, now seen corresponding path program 34 times [2020-07-20 16:59:52,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:52,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693866429] [2020-07-20 16:59:52,283 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:53,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:53,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:53,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:59:53,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:53,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10637 backedges. 1286 proven. 1541 refuted. 0 times theorem prover too weak. 7810 trivial. 0 not checked. [2020-07-20 16:59:53,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:58,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:58,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:58,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:58,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:59,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:59,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:59,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:59,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:00,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:04,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:04,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:05,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:06,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:06,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:06,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:07,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:07,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:07,510 INFO L134 CoverageAnalysis]: Checked inductivity of 10637 backedges. 1286 proven. 1581 refuted. 0 times theorem prover too weak. 7770 trivial. 0 not checked. [2020-07-20 17:00:07,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693866429] [2020-07-20 17:00:07,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:07,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 17:00:07,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380439917] [2020-07-20 17:00:07,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:00:07,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:07,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:00:07,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:00:07,512 INFO L87 Difference]: Start difference. First operand 603 states and 1406 transitions. Second operand 33 states. [2020-07-20 17:00:11,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:11,793 INFO L93 Difference]: Finished difference Result 1243 states and 3020 transitions. [2020-07-20 17:00:11,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 17:00:11,802 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 600 [2020-07-20 17:00:11,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:11,818 INFO L225 Difference]: With dead ends: 1243 [2020-07-20 17:00:11,818 INFO L226 Difference]: Without dead ends: 644 [2020-07-20 17:00:11,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1228 GetRequests, 1141 SyntacticMatches, 27 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 817 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=583, Invalid=3199, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:00:11,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2020-07-20 17:00:11,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 598. [2020-07-20 17:00:11,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 598 states. [2020-07-20 17:00:11,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 1419 transitions. [2020-07-20 17:00:11,861 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 1419 transitions. Word has length 600 [2020-07-20 17:00:11,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:11,861 INFO L479 AbstractCegarLoop]: Abstraction has 598 states and 1419 transitions. [2020-07-20 17:00:11,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:00:11,862 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 1419 transitions. [2020-07-20 17:00:11,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 886 [2020-07-20 17:00:11,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:11,874 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 60, 60, 40, 40, 36, 36, 36, 36, 36, 36, 36, 33, 30, 30, 30, 30, 30, 30, 30, 20, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:12,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:12,075 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:12,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:12,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1955560163, now seen corresponding path program 35 times [2020-07-20 17:00:12,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:12,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265018958] [2020-07-20 17:00:12,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:13,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 17:00:13,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:13,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 17:00:13,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:13,599 INFO L134 CoverageAnalysis]: Checked inductivity of 23412 backedges. 10609 proven. 426 refuted. 0 times theorem prover too weak. 12377 trivial. 0 not checked. [2020-07-20 17:00:13,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:24,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:24,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:26,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:27,412 INFO L134 CoverageAnalysis]: Checked inductivity of 23412 backedges. 714 proven. 2815 refuted. 0 times theorem prover too weak. 19883 trivial. 0 not checked. [2020-07-20 17:00:27,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265018958] [2020-07-20 17:00:27,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:27,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 17:00:27,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650165937] [2020-07-20 17:00:27,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:00:27,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:27,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:00:27,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:00:27,415 INFO L87 Difference]: Start difference. First operand 598 states and 1419 transitions. Second operand 25 states. [2020-07-20 17:00:29,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:29,942 INFO L93 Difference]: Finished difference Result 1353 states and 3360 transitions. [2020-07-20 17:00:29,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 17:00:29,945 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 885 [2020-07-20 17:00:29,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:29,958 INFO L225 Difference]: With dead ends: 1353 [2020-07-20 17:00:29,958 INFO L226 Difference]: Without dead ends: 719 [2020-07-20 17:00:29,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1789 GetRequests, 1727 SyntacticMatches, 19 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=334, Invalid=1646, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 17:00:29,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2020-07-20 17:00:30,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 583. [2020-07-20 17:00:30,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 583 states. [2020-07-20 17:00:30,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 583 states to 583 states and 1355 transitions. [2020-07-20 17:00:30,004 INFO L78 Accepts]: Start accepts. Automaton has 583 states and 1355 transitions. Word has length 885 [2020-07-20 17:00:30,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:30,005 INFO L479 AbstractCegarLoop]: Abstraction has 583 states and 1355 transitions. [2020-07-20 17:00:30,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:00:30,005 INFO L276 IsEmpty]: Start isEmpty. Operand 583 states and 1355 transitions. [2020-07-20 17:00:30,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2020-07-20 17:00:30,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:30,018 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 70, 70, 44, 44, 38, 38, 38, 38, 38, 38, 38, 35, 35, 35, 35, 35, 35, 35, 33, 26, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:30,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:30,219 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:30,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:30,220 INFO L82 PathProgramCache]: Analyzing trace with hash 177979568, now seen corresponding path program 36 times [2020-07-20 17:00:30,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:30,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90369711] [2020-07-20 17:00:30,221 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:31,214 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 17:00:31,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:31,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 17:00:31,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:32,174 INFO L134 CoverageAnalysis]: Checked inductivity of 28448 backedges. 14494 proven. 1727 refuted. 0 times theorem prover too weak. 12227 trivial. 0 not checked. [2020-07-20 17:00:32,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:33,718 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 17:00:45,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:46,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:46,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:48,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:48,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:50,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:50,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:51,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:51,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:51,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:51,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:51,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:52,483 INFO L134 CoverageAnalysis]: Checked inductivity of 28448 backedges. 1199 proven. 3613 refuted. 0 times theorem prover too weak. 23636 trivial. 0 not checked. [2020-07-20 17:00:52,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90369711] [2020-07-20 17:00:52,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:52,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 33 [2020-07-20 17:00:52,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072171457] [2020-07-20 17:00:52,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:00:52,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:52,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:00:52,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:00:52,487 INFO L87 Difference]: Start difference. First operand 583 states and 1355 transitions. Second operand 33 states. [2020-07-20 17:00:57,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:57,156 INFO L93 Difference]: Finished difference Result 1377 states and 3938 transitions. [2020-07-20 17:00:57,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-20 17:00:57,161 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 977 [2020-07-20 17:00:57,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:57,175 INFO L225 Difference]: With dead ends: 1377 [2020-07-20 17:00:57,175 INFO L226 Difference]: Without dead ends: 800 [2020-07-20 17:00:57,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1984 GetRequests, 1899 SyntacticMatches, 23 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=620, Invalid=3412, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 17:00:57,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2020-07-20 17:00:57,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 692. [2020-07-20 17:00:57,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 692 states. [2020-07-20 17:00:57,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 692 states to 692 states and 1776 transitions. [2020-07-20 17:00:57,229 INFO L78 Accepts]: Start accepts. Automaton has 692 states and 1776 transitions. Word has length 977 [2020-07-20 17:00:57,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:57,230 INFO L479 AbstractCegarLoop]: Abstraction has 692 states and 1776 transitions. [2020-07-20 17:00:57,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:00:57,230 INFO L276 IsEmpty]: Start isEmpty. Operand 692 states and 1776 transitions. [2020-07-20 17:00:57,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1329 [2020-07-20 17:00:57,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:57,250 INFO L422 BasicCegarLoop]: trace histogram [107, 107, 92, 92, 64, 63, 53, 53, 53, 53, 53, 53, 53, 46, 46, 46, 46, 46, 46, 46, 44, 28, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:57,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:57,451 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:57,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:57,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1992418150, now seen corresponding path program 37 times [2020-07-20 17:00:57,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:57,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583883338] [2020-07-20 17:00:57,453 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:58,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 17:00:58,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:58,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 1041 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 17:00:58,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:59,978 INFO L134 CoverageAnalysis]: Checked inductivity of 53049 backedges. 1988 proven. 5357 refuted. 0 times theorem prover too weak. 45704 trivial. 0 not checked. [2020-07-20 17:00:59,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:13,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:13,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:15,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:17,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:17,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:18,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:18,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:18,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:19,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:19,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:19,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:19,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:22,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:23,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:23,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:24,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 53049 backedges. 1988 proven. 5406 refuted. 0 times theorem prover too weak. 45655 trivial. 0 not checked. [2020-07-20 17:01:25,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583883338] [2020-07-20 17:01:25,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:25,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 37 [2020-07-20 17:01:25,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363933694] [2020-07-20 17:01:25,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 17:01:25,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:25,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 17:01:25,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 17:01:25,908 INFO L87 Difference]: Start difference. First operand 692 states and 1776 transitions. Second operand 37 states. [2020-07-20 17:01:31,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:31,456 INFO L93 Difference]: Finished difference Result 1739 states and 5876 transitions. [2020-07-20 17:01:31,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:01:31,460 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1328 [2020-07-20 17:01:31,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:31,482 INFO L225 Difference]: With dead ends: 1739 [2020-07-20 17:01:31,483 INFO L226 Difference]: Without dead ends: 1053 [2020-07-20 17:01:31,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2692 GetRequests, 2593 SyntacticMatches, 27 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=787, Invalid=4615, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 17:01:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1053 states. [2020-07-20 17:01:31,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1053 to 904. [2020-07-20 17:01:31,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 904 states. [2020-07-20 17:01:31,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 3019 transitions. [2020-07-20 17:01:31,639 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 3019 transitions. Word has length 1328 [2020-07-20 17:01:31,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:31,639 INFO L479 AbstractCegarLoop]: Abstraction has 904 states and 3019 transitions. [2020-07-20 17:01:31,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 17:01:31,640 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 3019 transitions. [2020-07-20 17:01:31,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-20 17:01:31,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:31,647 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 34, 34, 27, 27, 22, 22, 22, 22, 22, 22, 22, 18, 17, 17, 17, 17, 17, 17, 17, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:31,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:31,848 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:31,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:31,849 INFO L82 PathProgramCache]: Analyzing trace with hash -629663916, now seen corresponding path program 38 times [2020-07-20 17:01:31,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:31,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062130617] [2020-07-20 17:01:31,850 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:32,911 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:01:32,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:32,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:01:32,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:33,300 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 3142 proven. 116 refuted. 0 times theorem prover too weak. 5116 trivial. 0 not checked. [2020-07-20 17:01:33,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:39,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:39,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:39,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:40,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:41,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:41,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:41,512 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 333 proven. 1294 refuted. 0 times theorem prover too weak. 6747 trivial. 0 not checked. [2020-07-20 17:01:41,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062130617] [2020-07-20 17:01:41,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:41,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 21 [2020-07-20 17:01:41,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029201895] [2020-07-20 17:01:41,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 17:01:41,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:41,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 17:01:41,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 17:01:41,514 INFO L87 Difference]: Start difference. First operand 904 states and 3019 transitions. Second operand 21 states. [2020-07-20 17:01:43,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:43,226 INFO L93 Difference]: Finished difference Result 1834 states and 6356 transitions. [2020-07-20 17:01:43,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 17:01:43,230 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 535 [2020-07-20 17:01:43,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:43,247 INFO L225 Difference]: With dead ends: 1834 [2020-07-20 17:01:43,247 INFO L226 Difference]: Without dead ends: 936 [2020-07-20 17:01:43,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1083 GetRequests, 1037 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 17:01:43,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2020-07-20 17:01:43,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 904. [2020-07-20 17:01:43,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 904 states. [2020-07-20 17:01:43,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 3018 transitions. [2020-07-20 17:01:43,343 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 3018 transitions. Word has length 535 [2020-07-20 17:01:43,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:43,344 INFO L479 AbstractCegarLoop]: Abstraction has 904 states and 3018 transitions. [2020-07-20 17:01:43,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 17:01:43,344 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 3018 transitions. [2020-07-20 17:01:43,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-20 17:01:43,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:43,352 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 34, 27, 27, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 16, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:43,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:43,554 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:43,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:43,554 INFO L82 PathProgramCache]: Analyzing trace with hash -561013075, now seen corresponding path program 39 times [2020-07-20 17:01:43,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:43,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943887494] [2020-07-20 17:01:43,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:44,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:01:44,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:44,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 1010 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:01:44,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:45,154 INFO L134 CoverageAnalysis]: Checked inductivity of 7942 backedges. 4030 proven. 314 refuted. 0 times theorem prover too weak. 3598 trivial. 0 not checked. [2020-07-20 17:01:45,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:52,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:54,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:54,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:54,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:54,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:54,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:55,198 INFO L134 CoverageAnalysis]: Checked inductivity of 7942 backedges. 380 proven. 1455 refuted. 0 times theorem prover too weak. 6107 trivial. 0 not checked. [2020-07-20 17:01:55,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943887494] [2020-07-20 17:01:55,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:55,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-20 17:01:55,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191321023] [2020-07-20 17:01:55,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:01:55,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:55,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:01:55,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:01:55,201 INFO L87 Difference]: Start difference. First operand 904 states and 3018 transitions. Second operand 25 states. [2020-07-20 17:01:57,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:57,468 INFO L93 Difference]: Finished difference Result 1831 states and 6779 transitions. [2020-07-20 17:01:57,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 17:01:57,472 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 523 [2020-07-20 17:01:57,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:57,490 INFO L225 Difference]: With dead ends: 1831 [2020-07-20 17:01:57,490 INFO L226 Difference]: Without dead ends: 933 [2020-07-20 17:01:57,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1066 GetRequests, 1005 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:01:57,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 933 states. [2020-07-20 17:01:57,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 933 to 901. [2020-07-20 17:01:57,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 901 states. [2020-07-20 17:01:57,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 901 states to 901 states and 2986 transitions. [2020-07-20 17:01:57,573 INFO L78 Accepts]: Start accepts. Automaton has 901 states and 2986 transitions. Word has length 523 [2020-07-20 17:01:57,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:57,573 INFO L479 AbstractCegarLoop]: Abstraction has 901 states and 2986 transitions. [2020-07-20 17:01:57,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:01:57,574 INFO L276 IsEmpty]: Start isEmpty. Operand 901 states and 2986 transitions. [2020-07-20 17:01:57,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 17:01:57,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:57,582 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:57,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:57,783 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:57,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:57,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 40 times [2020-07-20 17:01:57,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:57,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926805574] [2020-07-20 17:01:57,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:58,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:01:58,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 17:01:58,900 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:01:58,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 17:01:58,990 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:01:59,063 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 17:01:59,063 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 17:01:59,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:59,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:01:59 BoogieIcfgContainer [2020-07-20 17:01:59,366 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:01:59,367 INFO L168 Benchmark]: Toolchain (without parser) took 346605.12 ms. Allocated memory was 146.3 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 104.2 MB in the beginning and 421.9 MB in the end (delta: -317.7 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,368 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,368 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.83 ms. Allocated memory is still 146.3 MB. Free memory was 103.8 MB in the beginning and 94.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,369 INFO L168 Benchmark]: Boogie Preprocessor took 26.37 ms. Allocated memory is still 146.3 MB. Free memory was 94.2 MB in the beginning and 92.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,369 INFO L168 Benchmark]: RCFGBuilder took 380.27 ms. Allocated memory was 146.3 MB in the beginning and 203.9 MB in the end (delta: 57.7 MB). Free memory was 92.9 MB in the beginning and 170.4 MB in the end (delta: -77.5 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,371 INFO L168 Benchmark]: TraceAbstraction took 345949.65 ms. Allocated memory was 203.9 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 169.8 MB in the beginning and 421.9 MB in the end (delta: -252.1 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2020-07-20 17:01:59,373 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 241.83 ms. Allocated memory is still 146.3 MB. Free memory was 103.8 MB in the beginning and 94.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.37 ms. Allocated memory is still 146.3 MB. Free memory was 94.2 MB in the beginning and 92.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 380.27 ms. Allocated memory was 146.3 MB in the beginning and 203.9 MB in the end (delta: 57.7 MB). Free memory was 92.9 MB in the beginning and 170.4 MB in the end (delta: -77.5 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 345949.65 ms. Allocated memory was 203.9 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 169.8 MB in the beginning and 421.9 MB in the end (delta: -252.1 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 8; VAL [x=8] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=8] [L8] COND FALSE !(n < 1) VAL [\old(n)=8, n=8] [L10] COND FALSE !(n == 1) VAL [\old(n)=8, n=8] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=7] [L18] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L20] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=7, fibo1(n-1)=8, n=7] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=7, fibo1(n-1)=8, fibo1(n-2)=5, n=7] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=8, fibo2(n-1)=13, n=8] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=6] [L18] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L20] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=6, fibo1(n-1)=5, n=6] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=6, fibo1(n-1)=5, fibo1(n-2)=3, n=6] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=8, fibo2(n-1)=13, fibo2(n-2)=8, n=8] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=21, x=8] [L37] int result = fibo1(x); [L38] COND TRUE result == 21 VAL [result=21, x=8] [L39] __VERIFIER_error() VAL [result=21, x=8] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 345.7s, OverallIterations: 58, TraceHistogramMax: 107, AutomataDifference: 56.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1968 SDtfs, 5331 SDslu, 17543 SDs, 0 SdLazy, 26197 SolverSat, 6866 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 18.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 33483 GetRequests, 30843 SyntacticMatches, 853 SemanticMatches, 1787 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20063 ImplicationChecksByTransitivity, 47.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=904occurred in iteration=55, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.5s AutomataMinimizationTime, 57 MinimizatonAttempts, 1931 StatesRemovedByMinimization, 56 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.9s SsaConstructionTime, 3.1s SatisfiabilityAnalysisTime, 255.7s InterpolantComputationTime, 16849 NumberOfCodeBlocks, 9292 NumberOfCodeBlocksAsserted, 141 NumberOfCheckSat, 32633 ConstructedInterpolants, 0 QuantifiedInterpolants, 23442259 SizeOfPredicates, 455 NumberOfNonLiveVariables, 24348 ConjunctsInSsa, 984 ConjunctsInUnsatCore, 112 InterpolantComputations, 2 PerfectInterpolantSequences, 432976/494828 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...